Engadget reports that Windows Phone 7.1 is the likely name for Mango OS update

Microsoft's proper preview event for the next big release of Windows Phone may be mere hours away, but there's still time for a bit of good old fashioned web sleuthing before then. Latest on our radar is this Microsoft Developer Network page listing out all the APIs in Silverlight for Windows Phone 7.1. That's right, your eyes do not deceive you, there's a whole extra decimal added to the OS number, ostensibly signifying the move to the Mango update we're all so hungry for.

  Windows Phone 7.1 is the likely name for Mango OS update